Question

Printr-un robinet curg intr-un bazin 12 l de apa pe secunda  .In cat timp vao umple 6  robinete acelasi bazin  al carui voum este de  3000l                       
Ordonati descrescator numerele  3,(13)   3,1(3)   3.13   3,13(1)    3,131

Answer 1

1r..........1s.................12l
1r...........x.................3000l

x=1*3000/12

x=250 s

1r.........250s..........3000l
6r...........y.............3000l

y=1*250/6

y=41, 6 s

3,(13)=3 13131313........

3,1(3)=3 13333333.......

3,13=  3 13000000.......

3,13(1)= 3 13111111......

3,131= 3 131000000.......

1)3,1(3)

2)3,(13)

3)3,13(1)

4)3,131

5)3,13